diff --git a/nunjucks/nunjucks.d.ts b/nunjucks/nunjucks.d.ts
index 6a6d384d87..f0f9b081f3 100644
--- a/nunjucks/nunjucks.d.ts
+++ b/nunjucks/nunjucks.d.ts
@@ -62,6 +62,7 @@ declare namespace nunjucks {
 			autoescape: boolean;
 		};
 
+		constructor();
 		constructor(loader: ILoader, opts?: ConfigureOptions);
 		constructor(loaders: ILoader[], opts?: ConfigureOptions);
 
@@ -122,6 +123,11 @@ declare namespace nunjucks {
 		getSource(name: string): LoaderSource;
 	}
 
+	export class WebLoader implements ILoader {
+		constructor(baseUrl: string, opts?: any);
+		getSource(name: string): LoaderSource;
+	}
+
 	export class PrecompiledLoader extends Loader implements ILoader {
 		init(searchPaths: string[], opts: any): void;
 		getSource(name: string): LoaderSource;